基于能动分块反射镜的激光相干合成实验研究

Experimental Investigation of Laser Coherent Combining Based on Active Segmented Mirror

研究自适应光学元件——能动分块反射镜在激光相干合成中对光束平移相位差的校正性能。实验采用信号发生器产生正弦电压经过放大后在分块反射镜上产生平移扰动,通过高速CCD探测远场具有平移扰动的光斑,利用高速数字电路对CCD数据进行实时处理输出闭环反馈电压用于校正平移扰动。实验针对不同频率的扰动信号进行了闭环控制。结果表明,系统可以对频率为50 Hz以下并且振幅大于一个波长的平移相位差扰动进行有效的补偿,在50 Hz扰动下,系统合成效率可达75%。

The correcting performance on piston aberration of beams with adaptive optics-active segmented mirror in laser coherent combining is studied. The piston aberration is introduced by active segmented mirror drived by high voltage which is produced by signal generator and amplified by high voltage amplifier. The far-field pattern with piston aberration is detected by high-speed CCD and the CCD data is processed by digital circuit to produce the close- loop voltage for correcting the introduced piston perturbation in real-time. This experiment performs close-loop correction in different piston perturbation. The experimental results show that the piston perturbation frequency of 50 Hz is efficiently controlled. System also can compensate the piston aberration above one wavelength and combining efficiency reaches 75 %.